Answer:
The answer is B. f(x) = (x − 1)(x − 2)(x + 1)(x + 2)
Answer:
A and D are the true number sentences
<span>The answer is 500 Because if you $2,000 +$9,000 = 11,000
11,000 - 10,000 - 500 = 500
Do you understand? hope this helped :)</span>
Answer:
The boat traveling at 24 kph when John goes downstream.
Step-by-step explanation:
We are given the following in the question:
John has a boat that will travel at the rate of 15 kph in still water.
Let x be the speed of the current.
Speed of boat in upstream
![(15-x)\text{ kph}](https://tex.z-dn.net/?f=%2815-x%29%5Ctext%7B%20kph%7D)
Speed of water in downstream
![(15+x)\text{ kph}](https://tex.z-dn.net/?f=%2815%2Bx%29%5Ctext%7B%20kph%7D)
Relation:
![\text{Speed} = \dfrac{\text{Distance}}{\text{Time}}](https://tex.z-dn.net/?f=%5Ctext%7BSpeed%7D%20%3D%20%5Cdfrac%7B%5Ctext%7BDistance%7D%7D%7B%5Ctext%7BTime%7D%7D)
We have to find the speed of boat in downstream.
Time to travel upstream for 35 km = Time to travel 140 km downstream
![\displaystyle\frac{35}{15-x}=\frac{140}{15+x}\\\\35(15+x) = 140(15-x)\\525 + 35x = 2100 - 140x\\175x = 1575\\x = 9](https://tex.z-dn.net/?f=%5Cdisplaystyle%5Cfrac%7B35%7D%7B15-x%7D%3D%5Cfrac%7B140%7D%7B15%2Bx%7D%5C%5C%5C%5C35%2815%2Bx%29%20%3D%20140%2815-x%29%5C%5C525%20%2B%2035x%20%3D%202100%20-%20140x%5C%5C175x%20%3D%201575%5C%5Cx%20%3D%209)
Thus, speed of current is 9 kph.
Speed of boat in downstream = 15 + 9 = 24 kph.
Thus, the boat traveling at 24 kph when John goes downstream.